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The influence of aerosol radiative forcing (ARF) on the boundary layer structure is nonlinear. The threshold of the modification effects of ARF on the boundary layer structure was determined for the first time, highlighting that once ARF exceeded a certain value, the boundary layer would quickly stabilize and aggravate air pollution. This could provide useful information for relevant atmospheric environment improvement measures and policies.
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https://doi.org/10.5194/acp-2020-553
https://doi.org/10.5194/acp-2020-553

  25 Aug 2020

25 Aug 2020

Review status: this preprint is currently under review for the journal ACP.

The impact threshold of the aerosol radiation forcing on the boundary layer structure in the pollution region

Dandan Zhao1,2,, Jinyuan Xin1,2,, Chongshui Gong3, Jiannong Quan4, Yuesi Wang1,2, Guiqian Tang1, Yongxiang Ma1, Lindong Dai1, Xiaoyan Wu1, Guangjing Liu1, and Yongjing Ma1 Dandan Zhao et al.
  • 1State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China
  • 4Institute of Urban Meteorology, Chinese Meteorological Administration, Beijing, China
  • These authors contributed equally to this work.

Abstract. Recently, there has been increasing interest in the relation between particulate matter (PM) pollution and atmospheric boundary layer (ABL) structure. However, this has yet to be fully understood because most studies have been superficial. This study aimed to qualitatively assess the interaction between PM and ABL structure in essence, and to further quantitatively estimate the effects of aerosol radiative forcing (ARF) on the ABL structure. Multi-episode contrastive analysis stated the key to determining whether haze outbreak or dissipation was the ABL structure (i.e., stability and turbulence kinetic energy (TKE)) satisfied relevant conditions. However, it seemed that the ABL structure change was in turn highly related to the PM level and ARF. |SFC-ATM| (SFC and ATM is respectively the ARF at the surface and interior of the atmospheric column) is the absolute difference between ground and atmosphere layer ARFs, and the change in |SFC-ATM| is linearly related to the PM mass concentration. However, the influence of ARF on the boundary layer structure is nonlinear. With increasing |SFC-ATM|, the TKE level exponentially decreased, which was notable in the lower layers/ABL but disappeared above the ABL. Moreover, the threshold of the ARF effects on the ABL structure was determined for the first time, namely, once |SFC-ATM| exceeded ~ 55 W m−2, the ABL structure would quickly stabilize and would thereafter change little with increasing ARF. The threshold of the ARF effects on the boundary layer structure could provide useful information for relevant atmospheric environment improvement measures and policies, such as formulating the objectives of phased air pollution control.

Dandan Zhao et al.

 
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Dandan Zhao et al.

Dandan Zhao et al.

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Short summary
The influence of aerosol radiative forcing (ARF) on the boundary layer structure is nonlinear. The threshold of the modification effects of ARF on the boundary layer structure was determined for the first time, highlighting that once ARF exceeded a certain value, the boundary layer would quickly stabilize and aggravate air pollution. This could provide useful information for relevant atmospheric environment improvement measures and policies.
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